Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c5d7db5ab0dd486…

MALICIOUS

PDF

71.9 KB Created: 2020-11-24 18:31:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9dcbb86b9b9f3a7fb873a63bc9d35568 SHA-1: 184c926093c90290a2ca1f91bf2085395dd8d3a3 SHA-256: 8c5d7db5ab0dd4865b3260f012060c9a954caf764e4c4f96ab36e8d80d2422cb
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The heuristic firings indicate the PDF is designed as a link farm, likely to distribute malware or conduct phishing. Although no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://cctraff.ru/strik?utm_term=review+the+following+credit+terms+and+identify
    • https://wawukonuxoni.weebly.com/uploads/1/3/4/0/134095992/kajutizer-wepuweve-masevame-kofijuje.pdf
    • https://cdn-cms.f-static.net/uploads/4365560/normal_5f9c0994ace99.pdf
    • https://fosaxobe.weebly.com/uploads/1/3/4/8/134882536/tekawi-runeliwug.pdf
    • https://cdn-cms.f-static.net/uploads/4370317/normal_5fb922dfe2c50.pdf
    • https://cdn-cms.f-static.net/uploads/4371808/normal_5f9435166cfde.pdf
    • https://xugibadibexupov.weebly.com/uploads/1/3/4/6/134684970/basez.pdf
    • https://gujodoludota.weebly.com/uploads/1/3/2/6/132681740/xukirixobije.pdf
    • https://weduzoviduluwiz.weebly.com/uploads/1/3/4/3/134385862/nolovopuga-jusezomena.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/woxotopapozokev/48504904203.pdf
    • https://s3.amazonaws.com/bezorito/mufubegigovapiji.pdf
    • https://s3.amazonaws.com/tonemakopinibem/keynote_powerpoint_template.pdf
    • https://s3.amazonaws.com/baxegezivumi/antimicrobial_stewardship_doh_manual.pdf
    • https://s3.amazonaws.com/rudelazifizuvo/lemigozila.pdf
    • https://s3.amazonaws.com/felasorarabipis/libros_de_alfred_adler_gratis.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e12d.bin
5f2e995a7cba715c1550df90e137c691f7bfcefdf548c7eb1168207fd5936bac
pdf-font-stream PDF embedded font (sfnt) at offset 0xE12D 5696 bytes
font_01_sfnt_off0000f486.bin
9da05b4417f6652326ad52c7e045736fb9f6a7c1bf0e9fedbb314bc8b44751fb
pdf-font-stream PDF embedded font (sfnt) at offset 0xF486 8644 bytes